US PATENT SUBCLASS 524 / 928
.~ Before 1930, exemplified

Current as of: June, 1999
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524 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

925  DF  NATURAL RUBBER COMPOSITIONS HAVING NONREACTIVE MATERIALS (DNRM) OTHER THAN: CARBON, SILICON DIOXIDE, GLASS TITANIUM DIOXIDE, WATER, HYDROCARBON, HALOHYDROCARBON {3}
928.~ Before 1930, exemplified

DEFINITION

Classification: 524/928

Before 1930, exemplified:

(under subclass 925) Subject matter wherein the patent is before 1930 and the system is either claimed or appears in an operative embodiment.